Sine wave template



FIG. 1 is a front elevational view of a sine wave template showing my new design, the rear being identical except that the printed matter has been omitted;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a sine wave template, substantially as shown and described. 